The factory cam that was used in the 6 cylinder Corvettes and the 261 medium duty truck engines added a little more low end torque and a slight gain in HP without creating a choppy idle. The Elgin E-323S cam is an exact duplicate of that grind, with slightly different clearance adjustments. I don't think it's currently in production due to a lack of new cam cores being made. The Melling CCS-1 is still available new in very limited quantities. It has a somewhat more radical exhaust lobe which helps exhaust scavenging at medium to high engine sped for more efficient volumetric efficiency, also without creating poor idle characteristics or reducing intake manifold vacuum. Both cams will require a slightly richer carburetor mixture to get their best performance- - - -not necessarily MORE carburetor- - - - -just a bit richer than original.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!